bmp085.h

00001 /**
00002 @file bmp085.h
00003 
00004 @brief Header file containing member functions and variables
00005 
00006 */
00007 
00008 #ifndef __BMP085_H__
00009 #define __BMP085_H__
00010 
00011 #include "mbed.h"
00012 
00013 #define BMP085_I2C_ADDR_READ  (0xEF)
00014 #define BMP085_I2C_ADDR_WRITE (0xEE)
00015 
00016 #define CTRL_REG_ADDR (0xF4)
00017 #define DATA_REG_ADDR (0xF6)
00018 
00019 #define MEASURE_TEMP_CMD (0x2E)
00020 #define MEASURE_PRES_CMD (0x34)
00021 
00022 // MSB addresses, MSB first
00023 #define CAL_DATA_AC1    (0xAA)
00024 #define CAL_DATA_AC2    (0xAC)
00025 #define CAL_DATA_AC3    (0xAE)
00026 #define CAL_DATA_AC4    (0xB0)
00027 #define CAL_DATA_AC5    (0xB2)
00028 #define CAL_DATA_AC6    (0xB4)
00029 #define CAL_DATA_B1     (0xB6)
00030 #define CAL_DATA_B2     (0xB8)
00031 #define CAL_DATA_MB     (0xBA)
00032 #define CAL_DATA_MC     (0xBC)
00033 #define CAL_DATA_MD     (0xBE)
00034 
00035 
00036 /** 
00037 @brief Simple library for interfacing with Bosch BMP085
00038 
00039 @brief Revision 1.0
00040 
00041 @author Tim Meese
00042 @date   January 2015
00043  *
00044  * Example:
00045  * @code
00046  
00047  #include "mbed.h"
00048  #include "bmp085.h"
00049  
00050   
00051  * @endcode
00052  */
00053 
00054 
00055 class BMP085
00056 {
00057 
00058 private:
00059 
00060     // I2C interface
00061     I2C * i2c;
00062  
00063     const float p0 = 101325;     // Pressure at sea level (Pa)
00064     float altitude;
00065    
00066     // Calibration parameters
00067     short AC1;
00068     short AC2;
00069     short AC3;
00070     unsigned short AC4;
00071     unsigned short AC5;
00072     unsigned short AC6;
00073     short B1;
00074     short B2;
00075     short MB;
00076     short MC;
00077     short MD;
00078     
00079     // uncalibrated temp, pressure
00080     long UT;    
00081     long UP;
00082     
00083     // shared values 
00084     long X1;
00085     long X2;
00086     long X3;
00087     long B3;
00088     unsigned long B4;
00089     long B5;
00090     long B6;
00091     unsigned long B7;
00092     long T; // temp in 0.1 degrees C
00093     long p; // pressure in Pascals
00094 
00095     void readCalData();
00096     void readUncompTemp();
00097     void readUncompPressure(int mode);
00098 
00099 public:
00100     /** Create a BMP085 object connected to the specified pins
00101     *
00102     * @param clkPin  Pin connected to clk
00103     * @param dataPin Pin connected to data
00104     * 
00105     */
00106     BMP085(PinName clkPin, PinName dataPin);
00107     
00108     /** Initialise SHT11
00109     *
00110     */
00111     void init();
00112     float getTemperature();
00113     float getPressure(int oss);
00114     long getUT();
00115     long getUP();
00116 };
00117 
00118 #endif /* __BMP085_H__ */